Allen Stream Crossing Project (Project) (Notification of Lake or Streambed Alteration, No. EPIMS-MEN-55822-R1C)

The Allen Stream Crossing Project, identified by Notification of Lake or Streambed Alteration No. EPIMS-MEN-55822-R1C, involves upgrading a single existing compacted soil stream crossing located in the Russian River watershed in Mendocino County, California. The project is situated approximately one mile northeast of Potter Valley at latitude 39.32978 N and longitude 123.09761 W. Approved by the California Department of Fish and Wildlife, the project is granted a categorical exemption under CCR Title 14, section 15301, as it constitutes a minor alteration of an existing crossing without expansion of use. The scope of work includes the excavation of fill from the road and crossing outfall, the construction of a broad dip throughout the crossing, and the installation of a rock armored outfall. Construction must adhere to the design plans submitted on September 16, 2025, utilizing 6-inch angular rock and 1.5-inch angular base rock. To protect the environment, the crossing is restricted to seasonal use only when no surface flows are present. Primary administrative contact for the project is Environmental Scientist Penny Lancaster.